Change in diffusivity with the active force magnitude, for both poorly annealed and well-annealed samples, shown for values of the active force for which the MSD shows a diffusive regime within the minimum expected waiting time for particles to escape the cage of their local neighbourhood ( Supplementary Information ). The diffusivity data for f > 0.8 are fit to a power law (dashed magenta vertical line indicates the lowest f for which the diffusivity data are included in the fitting procedure), with data for f < 0.8 in reasonable agreement with the extrapolation from the fit. The dashed blue vertical line marks the value of f at which t ss goes through a maximum in d for the poorly annealed case. The extrapolation of the diffusivity data indicates a vanishing diffusivity at f = 0.43.
